Rank the species from strongest to weakest base:
Cl-, OH-,NH2
To rank the species from strongest to weakest base, we need to consider their basicity. Basicity refers to the ability of a species to accept a proton (H+). In general, the stronger the base, the more easily it can accept a proton.
To determine the basicity, we can consider the relative stability of the conjugate acids that are formed when the species accept a proton. The more stable the conjugate acid, the stronger the base.
Let's examine the three species you provided:
1. NH2- (Amino group): Amino groups are known to be strong bases. When NH2- accepts a proton, it forms NH3, which is a stable compound. Therefore, NH2- is the strongest base among the species you listed.
2. OH- (Hydroxide ion): Hydroxide ions are also strong bases. When OH- accepts a proton, it forms H2O, which is a very stable compound. Although not as strong as NH2-, OH- is still a strong base.
3. Cl- (Chloride ion): Chloride ion is a weak base compared to NH2- and OH-. When Cl- accepts a proton, it forms HCl, which is a strong acid. The conjugate acid of Cl- (HCl) is more stable than the conjugate acid of OH- (H2O). Therefore, Cl- is the weakest base among the species you listed.
In summary, the ranking from strongest to weakest base is:
1. NH2- (Amino group)
2. OH- (Hydroxide ion)
3. Cl- (Chloride ion)